Merge pull request #1646 from cigumo/ios-audio-interruption-handling

adds iOS audio interruption handling and recovery

src/modules/audio/Audio.h

@@ -291,6 +291,12 @@ public:
 	 **/
 	static bool setMixWithSystem(bool mix);
 
+	/**
+	 * Pause/resume audio context
+	 */
+	virtual void pauseContext() = 0;
+	virtual void resumeContext() = 0;
+
 private:
 
 	static StringMap<DistanceModel, DISTANCE_MAX_ENUM>::Entry distanceModelEntries[];

src/modules/audio/null/Audio.cpp

@@ -203,6 +203,15 @@ bool Audio::isEFXsupported() const
 	return false;
 }
 
+void Audio::pauseContext()
+{
+}
+
+void Audio::resumeContext()
+{
+}
+
+
 } // null
 } // audio
 } // love

src/modules/audio/null/Audio.h

@@ -86,6 +86,9 @@ public:
 	int getMaxSourceEffects() const;
 	bool isEFXsupported() const;
 
+	void pauseContext();
+	void resumeContext();
+
 private:
 	float volume;
 	DistanceModel distanceModel;

src/modules/audio/openal/Audio.cpp

@@ -26,6 +26,10 @@
 #include <cstdlib>
 #include <iostream>
 
+#ifdef LOVE_IOS
+#include "common/ios.h"
+#endif
+
 namespace love
 {
 namespace audio
@@ -189,10 +193,18 @@ Audio::Audio()
 
 	poolThread = new PoolThread(pool);
 	poolThread->start();
+	
+#ifdef LOVE_IOS
+	love::ios::initAudioSessionInterruptionHandler();
+#endif
+        
 }
 
 Audio::~Audio()
 {
+#ifdef LOVE_IOS
+	love::ios::destroyAudioSessionInterruptionHandler();
+#endif
 	poolThread->setFinish();
 	poolThread->wait();
 
@@ -293,6 +305,17 @@ std::vector<love::audio::Source*> Audio::pause()
 	return Source::pause(pool);
 }
 
+void Audio::pauseContext()
+{
+	alcMakeContextCurrent(nullptr);
+}
+
+void Audio::resumeContext()
+{
+	if (context && alcGetCurrentContext() != context)
+		alcMakeContextCurrent(context);
+}
+
 void Audio::setVolume(float volume)
 {
 	alListenerf(AL_GAIN, volume);

src/modules/audio/openal/Audio.h

@@ -95,6 +95,8 @@ public:
 	void pause(love::audio::Source *source);
 	void pause(const std::vector<love::audio::Source*> &sources);
 	std::vector<love::audio::Source*> pause();
+	void pauseContext();
+	void resumeContext();
 	void setVolume(float volume);
 	float getVolume() const;